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In such cases, models frequently exhibit approximation behavior, producing a plausible bounding box that satisfies only part of the expression (\\eg, preserving the original object while ignoring modified contextual cues). Because mismatched captions represent realistic edge cases, this behavior compromises reliability and raises concerns from an explainability perspective. Identifying its underlying causes is thus essential for improving model faithfulness and interpretability.\n  Adopting a mechanistic interpretability viewpoint, this work examines whether embedding anisotropy contributes to counterfactual failures. 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Identifying its underlying causes is thus essential for improving model faithfulness and interpretability.\n  Adopting a mechanistic interpretability viewpoint, this work examines whether embedding anisotropy contributes to counterfactual failures. 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